如何使用Ajax，Java，Spring Framework将文件从网页上传到Google Cloud Storage

Question

我正在尝试上传文件以及其他一些信息，但是在服务器端，由于
java.lang.NoClassDefFoundError：java.io.FileOutputStream是一个受限类。 有关更多详细信息，请参阅Google App Engine开发人员指南。

我的要求是使用GCS客户端库将上传的文件保存到Google Cloud Storage。 请帮忙。

这是我的代码：HTML表单

<form id="createWorkerForm">
<input type="text" class="form-control" id="firstName" name="firstName" placeholder="First Name">
<input type="file" class="form-control" id="photoCopy" name="photoCopy" placeholder="Photo Copy">
<input type="submit" class="btn btn-primary" id="createWorker">
</form>

jQuery Ajax

var formData = new FormData($(this)[0]);
$.ajax({
    url: url+"/uploadPic",
    type: "POST",
    enctype:"multipart/form-data",
    contentType: false,
    processData: false,
    cache: false,
    data: formData,
    success: function(response) {
        alert("success");
    },
    error: function() {
        alert("unable to create the record");
    }
});

分派器Servlet-支持多部分文件上传的配置

<bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

控制器中的方法

@RequestMapping(value="/createWorker",method=RequestMethod.POST)
public @ResponseBody String createWorker(HttpServletRequest req){
    FileItemIterator iterator;
    FileItemStream item;
    InputStream stream = null;
    try{

        String firstName = req.getParameter("firstName"));
        ServletFileUpload upload =new ServletFileUpload();
        iterator = upload.getItemIterator(req);
        while (iterator.hasNext()) {
            item = iterator.next();
            stream = item.openStream();

            if (item.isFormField()) {
                log.warning("Got a form field: " + item.getFieldName());
            } else {
                log.warning("Got an uploaded file: " + item.getFieldName() +
                        ", name = " + item.getName());


            }
        }

        return "success";
    }
    catch(Exception e){
        ErrorUtil.printErrorLog(className, "showIndexPage", e);
        return "fail";
    }
}

错误：

java.lang.NoClassDefFoundError: java.io.FileOutputStream is a restricted class. Please see the Google  App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at org.apache.commons.io.output.DeferredFileOutputStream.thresholdReached(DeferredFileOutputStream.java:122)
at org.apache.commons.io.output.ThresholdingOutputStream.checkThreshold(ThresholdingOutputStream.java:221)
at org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:128)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:107)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:156)
at org.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:139)
at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1047)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:892)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

请帮忙..！！！

Answer 1

我找到了解决方案。

<!-- this line will not work with google app engine -->
<bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

<!-- this will work with google app engine -->
<bean id="multipartResolver" class="org.gmr.web.multipart.GMultipartResolver">
    <property name="maxUploadSize" value="1048576" />
</bean>

请参阅： https : //code.google.com/p/gmultipart/